A DBC file contains Common Parameters and Parameters that are unique to what you are monitoring (Oracle,Informix,...):

• Common Parameters (Not DBMS-Specific)
• Informix Parameters
• MSSQL Parameters
• Oracle/UX-Linux DB Parameters
• Oracle/NT DB Parameters
• Oracle Apps Parameters

Example dbc File

# --------------------------------------------------------------------
# System: dbservr1 / SAP-PMP
# --------------------------------------------------------------------
Host:             dbservr1
Title1:           SAP-PMP
Title1_URL:       /dba/appls/sap_AIT.html
Title2:           Mfg.
Userid:           orapmp
DBMS:             Oracle
ORACLE_HOME:      /oracle/PMP
ORACLE_SID:       PMP
T_Disk_Full:      90/95
T_Extents:        80 
Must_Be_Up:       Y
Backup_Age:       32
Backup_Command:   /usr/local/dba/tools/ora_backup {SID} LVL1 >> /opt/oracle/adm/cronlog/ora_backup_{SID}_DBAmon.log 2>&1
Pager_EMail:      pageora@catdog
Notify_List:      2

Syntax

• Comment lines have a # in column 1.
• All parameters and values are case sensitive.
• Parameters are in the format:
  • Parameter-Name: (the ending colon must be specified)
  • At least one space
  • Value
• The notify_list: parameter MUST be the last parameter for any DBC file.

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This Document: http://dbamon.com/config/dbc.shtml